Long-term nitrogen fertilizer is suitable for all kinds of crops and various soil conditions. There are mainly two varieties of long-acting nitrogen fertilizers that are currently used in China: long-acting urea and long-acting ammonium bicarbonate. The application method is basically the same as that of urea and ammonium bicarbonate. Specific application points are as follows:
The nitrogen release of long-term nitrogen fertilizer is relatively slow, and the peak release period is about 5 days later than urea, so it should be earlier than the conventional application period of urea. Generally 5 to 6 days in advance in early spring and 3 to 4 days in advance in summer.
Long-acting nitrogen fertilizers have stronger nitrogen retention capacity in soil and higher utilization rates. Therefore, its use is slightly less than that of normal nitrogen fertilizers. It is usually 10% to 15% lower than the constant.
Due to different soil qualities, the long-acting nitrogen fertilizers also have significant differences in their ability to absorb and retain soil. The absorption and preservation ability of clay is strong, and the amount of clay can be more; the amount of sandy soil should be used in small amounts and multiple times.
To apply long-acting nitrogen fertilizer scientifically according to different nitrogen uptake characteristics of crops.
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